515 ILCS 5/10-50
All rainbow trout, lake trout, brown trout, brook trout, Atlantic salmon, coho salmon, chinook salmon, pink salmon, or other salmonids when taken or in the possession of a person after having been taken from the waters of Lake Michigan shall be not less than 10 inches in length.
(from Ch. 56, par. 10-50)
(Source: P.A. 87-833.)